From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Engineering committee meeting report on engine lubrication and piston issues.
| Identifier | ExFiles\Box 16\1\ Scan102 | |
| Date | 10th March 1926 | |
| Oy1-E-31026 March 10th, 1926 To: Mr. Nadin Mr. Bagnall Mr. Hulley Mr. Caswell Mr. Moon - Mr. Beaver Mr. Ross Mr. Burton Mr. Southern From: Mr. Olley ENGINEERING COMMITTEE Report of Meeting of March 9th, 1926 Subject: Engine Lubrication Present: Messrs. Nadin, Bagnall, Hulley, Caswell, Moon and F.Gariazzo. Summary: Decided to make necessary modifications at once to permit earlier opening of extra oil valve, when required, (see section 7 below). Gariazzo pointed out present situation of general under lubrication. Showed scored piston off demonstrator at 8500 miles. Caswell showed two similar pistons off Boston demonstrator. W.H.M. showed set of 6 pistons off CX{Major Len W. Cox - Advertising Manager} after 15,000 miles in perfect condition. Comparison of pistons showed that CX{Major Len W. Cox - Advertising Manager} were about .040 thicker in the wall, and 2 to 3 ozs. heavier than present pistons. Also wristpins were not quite such a tight fit in CX{Major Len W. Cox - Advertising Manager} pistons though they were shrunk in place. CX{Major Len W. Cox - Advertising Manager} pistons were not dynamometered but were run initially rather slowly for 30 miles and afterwards as hard as any car we have used. No extra oil except starting and full throttle. This was in February 1925. Generally our complaints are from cars used much in cities, rather than from cars driven hard in open country. Taking the evidence: 1. Heavier or lighter pistons. Present pistons are within the drawing limits for thickness, .125 to .150 on the thinnest part of the skirt. These limits have been successfully used for two years. CX{Major Len W. Cox - Advertising Manager} pistons are about .010 to .015 above the limit. On the whole this was considered unimportant. | ||